We may have found other answers which could help you.
Click here for Cleaned Oiled NeedleWhat size needles can I use for my Singer 39a3?
My CG 500/550 Singer Sewing Machine's bobbin isn't working?
Singer 507?
the thread is bunching on underside of fabric it looks like birdnest?
Engine revving up ?
how to get the tension right on my machine?